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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9170038f5b78f0a3de4de9d66a40501d052373a2a34150fb4817118ced7dfe4e' 
  AND token = 'hodZNlMysXDSyzQFoFAY/EpcWAlQ0tnTUOMuDRfOZpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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