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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec2eb8b8ed4b3faa98f4e241884e8b9d5f422fb63f89bb9da1a651be6d7ac965' 
  AND token = '+3zV4yh6lKgPCQitteJaxqnjUVOr6/dDEZ0Oaq9XQgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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