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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f00270db02d21d23a2c05b8b767ee579877aed8ac43e741509d654c99a72d0' 
  AND token = 'D3ALg4R/yO2lKgh30dmuC37tiEc9/z/+7FpADMvYdIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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