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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be6c80f32cf908eef3773d9327834e6ecdd32f8e6c6ea4857ce759a97abb408' 
  AND token = '6pj7O0TSeZRtEq/6f4x4jRYRKhZoYzFDrr0oTPWp8tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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