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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01958639a328e7ee377c82e1a50e6bb6e4551d478d4e3ba544cab11876cbaad' 
  AND token = 'hjajEkhWINhFpDr4x0Ve9+Me/of7OdizA2eTbFZ+VLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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