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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d9540819f88ddddf089e8f1a000e3d248b195d30fa3eeda652ed7aacd6e7b5' 
  AND token = 'pTZazxtOjX36H7spBFxWwvg9022qpfG6zUPxPYPycQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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