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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ca15634b701664b3ab46bdbd4f6a075558e7d586ece843b02241329f564b2c' 
  AND token = 'ZnrKEjzsFgUnr0pvLfhoz7esMInK/x4aS4wVUStcz2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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