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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e297b3371688e1de48d1a19b91a0ee4d52daf9d29a4d377bd2e24d9d557417' 
  AND token = 'vriwy2dj3YlB8BAfsYfkD49fy6KGaBflnS+9V6O/Cx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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