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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a24d13cc395a90de3132116c7ec9cc0b419f8b23e902553ab0d02ee5fc0229c0' 
  AND token = 'KnKJl2IBajaTom+u0cxGJdtG1p08ueFhMIoZuHaJXP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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