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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d401d9cff6f94ff2998555e69306d02b4d3037378aee2e14101d955a05ed08d' 
  AND token = 'UU3lH1WaFvVsMC8975sS0qX3ffWXKDYyQlPCbK9Mtt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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