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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a357dfbf86aaeccd535a432a9810e745237d8587734388b615a60c0b96966580' 
  AND token = '3RHD5wcHKZNWtg8cT8uf2OepqJfi1Dq1zMvXMqwUodI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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