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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcba25cfa9f37333bd6c166266841e7cfdf9db6db95dd2aae114062ef4da921' 
  AND token = 'D9oZy+aSpDrYjxdbrhACN2V80GiqzA7q72/bqc/z5m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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