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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '419f7d5eab4f4b2f2dc0d4a2374f927a82ae24caca4cb6ba6b6c7ca67be61cd7' 
  AND token = '7LVlGcU23yK6T9JDqfiiRRY9ikRuQ5QRek1lc2CLg0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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