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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf834fbc6c1ceac80b7f822bbc9bd8dd2f37fd5a53f519eea451ef3b256bfef' 
  AND token = '6avnHRk8XPE2LZIwa4m9kcp/1X4PcDhX7aIl+lM6pLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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