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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a96510c2cf074ecf6f0363f81aac306affe33e3e1ba449eb6f565401058057b6' 
  AND token = 'qqQmZI2AvkB8/ueGuCe8fFjaFxEDp72rMdjPn7hE+Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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