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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a4b80f379ec6fcad0d64b8888c022606f8f1647c354b7203cfa9838ed823fce' 
  AND token = '9p+vtcKyHgBahru6oe02yFmhsJWdjJKKB1f3gFgtmaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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