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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2767e52501316d3bc383249db51896e3fe1ea74c830bebbd8c93672ead4265eb' 
  AND token = 'Swgix8HMolbUDeB5Y3NZtQNsglXpIYH0dRfGCXI/5Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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