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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be2e4738affe72eb3f47d5eb25de3cd56aafab48a7bb6b241d40f43c7fd2a02' 
  AND token = 'ttGvhl3TdiCFTsK+f84Z7q7w1quwcLgyVSQQTAVfN8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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