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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3301d557418d35517a81096aea2fc0ffa0beb78820033311bbe141efef4610c5' 
  AND token = 'oMqGyJL1QFMtsrykOtFpR21IkZs+Yfw/ucUz9OqUvF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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