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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2028493a603e0f4a170630e602e3ca8070091e79b1c4054dfb5f82c12757bfe' 
  AND token = 'saFWXij8jb24LVNUWvccbAG4NoirqiD/IyRxIvquiwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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