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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7e34c7e8ccfce664da6bb4ba6b9c2149a612618d8f7ba2e4f78a941975d934' 
  AND token = 'jxULgiropGfaNFf8GKS+d1Llmn9Gyky1r1imM4YZi9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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