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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb1386333675bdf0bbf0e3b572b0b46a3f8a56ad560cbc217431eea1fb88aa4' 
  AND token = 'wNYEfXmknTPCfHgMPtnk3Bj9Ax8WeOb7pbffZB7HiYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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