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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2734dfe1e2db04d7028b23a18f061fcfb78df54d5e7a3dede3c89749ffaa63cc' 
  AND token = 's/JBjdxW1MHVnvslu2/t0VFoP04QO8LZLnercFziRuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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