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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84214d0e2571bf7cfa6a4b1066307e7c2bb76623d9b3c6cea76cf58e92f0ea9' 
  AND token = 'tWTkQWHYNl/6GdzYfUTYoELQ9MFiyAVcbzT4OhnXzYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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