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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a08e2527204fd631e6cd9a2ade08ca0b0e024c389ee90ab245421399fd020e8' 
  AND token = 'F1zNMHHZ9lDEtLFqCaUnI0YHGIk57g9Sy53DcREojwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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