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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671764548aea31e4eccce9111aa8be80ad7c74ac984944c304edd4a2b89d27f1' 
  AND token = 'oBqR9FatO2q/hWnQ6772d/jmH7UAjZt+bXFnQC7i3KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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