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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d9d614f277e23eef2b9a59e7ee62ebf395b70f109b9d36478000ee61e448d3' 
  AND token = 'GbZnej33EuCGj+OHcT72+/EDd6NHnF+TU8rSmuNCbZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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