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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9582c2852e013d0ea98fba7ad0ce7baf31c3ed5ace5ec562f818492bb64d0add' 
  AND token = 'xJMmfzvjYEVwRuXjxnb57HLHqrPxLvxBUce9htlzhxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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