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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6678f8399e2f968816bdeec5bd8aa64a9fc4b79758e1751a7a27f7cb3b2fa969' 
  AND token = 'l/4SrteELoVf3PRFuDrkB8vA/WhCKhkFMtO+Ml3vmvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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