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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d56c11dd1b377e95c9d4db05dce3d587e139c02bcb39d9756b683b62a34c27' 
  AND token = 'Ty8ucjL3YXMnxFUxH4gJsxb5soK8ggWBjAurxjoYcYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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