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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a93311e46f2a43cbf9633dac8788982c99cf7a8f33ccfb7dd6425e9fe979c84' 
  AND token = 'uCT1KzUbwueMGvCU5Y4emUAouVO+nvXaNtamxXhQCUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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