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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19097ef6721cf16f5a6fac8317bc986d8e532ac41fceaa51345e0f7d22bc2be' 
  AND token = '+k0VuebNfrllNfOf3WYGIRa0UkL38FM8+s9btpwCIM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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