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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30732c7680f3332a66bc5d527e4f1e295c1689c9b451735a6acf3dc38b3bb2b3' 
  AND token = 'NquG45LfG+nXotHXOX/Xnq6qjWH5WfJ/ragPcbSpFIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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