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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5789c156fb94592b0aa6e2bf12fdb961d6d97f418176d73f4d8ae7325b3aee' 
  AND token = 'o6DUbfmQ17QyDgb2dsDP5mGc6mpzwkba5tvUoswA1Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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