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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc72c6d3cbe62c40ff0a3d18dc662d101820e6729c955be22c51d215a9cd4d1' 
  AND token = 'jfYeHZHFdN3Errs5EhVhS3LHDoAYiKtUsnK7fRjYhoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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