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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6f8e40fee3bb464afd4752707c2e538db806e155002342651f5db3f62402f76' 
  AND token = 'GNZZVoIq3hOZNbjc81RPuMp7S5t/Lywgg5puUYuC9n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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