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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d5f1fb63b454e583dc0afa6d089e4cb5e7051f356e0d6c9d1d324b7553fcf0' 
  AND token = 'pSZozFgvoY1q862lK36FqwPSipIsg+0YPaSOASLIu74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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