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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b5f46942fe30d64e49c45a19a3b76cae1dd6b3c2d13dc1bb72a32e3c7553f7' 
  AND token = 'eDXPTShYB7T2nWHDkboP4GbQZtherYJW9DaBowICL88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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