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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '751c800d59c46599c5c9fa19caa8ee7211b8427f56f8ebbd1c38547c2a25b99f' 
  AND token = 'cvxx7K7IasF9ZNf10Xux7bmjhCDyZaQNnjUmH5rngww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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