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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce466bcea522fbf26aa288cad6202896733b4b211bafb74010d14f3e432b0ae9' 
  AND token = '/A0/lGENo6tkogd80B3j33S0p+7JUS3Ey+0TQ4SwVMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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