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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2c55642c0a0a44f228f5d94a8d577df546ff0877e27761fc9fb295d89721d6' 
  AND token = 'hH6zH8vBtvv0QxmLzckqKhbLtlS25NXWHUQ5U8+0bco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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