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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b28f1c57cd6cd805934d422c1a4e1ecb251a2da423cb430a9905a7f15c3115' 
  AND token = '34ZQIzqRR3ZnN0q9wzQwta+KCxG3eruKxm0wSP8FLhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}