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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0312438a1f3e5fc7f4ae4d57020920d643ca71b68bd4042f594d66b7ae080372' 
  AND token = 'q+uSbIQ5uSd2CyS0B2AQ6qv2nLbgBOq8CDY6EC7SdxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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