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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65631137183caf4e05af9de0b1250367b558a7d699b7bffa97db8ae21d25585d' 
  AND token = '8Lm8sIm5rnCFAbO0ou+fdVy411q9Ypb1ItsEFch0ZXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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