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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3a2475e4d3dcf0ee4c3a86b073e1a173f40641cda84cb21ecde7e9a4d0c0a6' 
  AND token = 'Df27RGo3Zy8h+UlksX2/iyGc2SSN810YTeXwOBNMATM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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