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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5eb1b70acce367ceaa80a4346547ef1dba801693e4e9b298252585e2f3713b' 
  AND token = 'iofUjHbgq7E6ck88x3EzmDf2Rx+QnTPlejmrlj1QA1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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