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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5141ed9a3ab46d99074cf3a26afc8838649e11c10845eb4cd3765dc75c543d56' 
  AND token = 'GDfyN5ACK1f/0RrFkg3Z/nzXAj6/CW8vWknYIJETycU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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