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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dfc6fc94f94086705e9143ddb780400aa29cf1a19111137b8f8a7e049c85133' 
  AND token = 'fVCTwBKNlXmn49k3aj6jnjD6cEhip8sS54GUq5CE3bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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