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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feba4d2f24b499d923cb66e1e4314227d3749d3428419d4507a4e620f7df64b4' 
  AND token = 'a9MSfX4ERNL/+OhdpfGrWwUXhgzgF6SquY2TVm0Xkfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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