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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ed18ffc75ed9f31b3a7ad14686497866c65b134c9e996d3202f9e184322dda' 
  AND token = 'LwwfldRTNDhi6f6R13jZNviHsnIL4gMi6g5SQtCEyc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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