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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c82dffc0380c7549129dbbd138dd5778da1baa61a47545a2c751a40f90a5c34' 
  AND token = 'uc5/7WESuY7/vacCQXjwYvyFCwn/NGiPNlNvZCuWxho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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