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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f9e54b0b29b17daf01627d21e7768b1fda36c4b920d59e22a8cebdb8d834ec' 
  AND token = 'h6P4QPKKVMpWPF3CO5EuGWXZdkOS98VNBMCssn5moJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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