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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e208b9984aeea736d99c1510e2f2b9234c0d0f58168e816cab9e6a8f3cbc9b' 
  AND token = 'Jf+OCsM9uDIL83BxWsii3Ry2A2mRcZZXUoyDFtK3zRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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