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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d530f47799a52ed48c428075d63517e8dbe38fda0c4a4706c5a5ae386e61b4' 
  AND token = 'qawWHe6nEPTSZHdvY4mgN9imGygYxDtHCNJgQOr2LBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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