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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e8492be99fe17d843405ccd5165e7e5877bf370c0bee2f9cdd4d59af725b0ae' 
  AND token = 'JJb/+FggQDlSBi6J6QoTbO8Dzcqq4BYGlvzHit9scnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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