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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c0632030de9fc5a33ca095be9a110931bea18fb97a01894f18cd8458e78f3b7' 
  AND token = '4cPsvPwZCRqZnceFSj0MOHVT5kMPKcwvpL5+t5veFuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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