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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f3417e2a7ae494837e58201802bad882f5caa8c7ebe268927892774f8be1ef' 
  AND token = '54yIC9ApD3yaZ2EQyAoFDcPfXKO8eM4dHyAQKDqB1C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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