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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74fa438e065b69e8386299750a91df8acc007a6303ae3af0bb5d46ebed91aed2' 
  AND token = '9H1YtIp+Yk3dzUbjkyn6Agi+P4LL9h7tkTdCbDPTYv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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