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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17153f6d23ce894e9ddd9e8074f29502816f036ac7f3aa0c562db788acef5954' 
  AND token = 'sLoMkGYfptBUApZa0KO530kpT/Sfk6Ua+kPYR3/pdMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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