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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b706f7c1d207c413f4152a8b3df40c60aabf19a6a76149f7ab61b4226dc0594d' 
  AND token = 'QLXzym5H0kdHypBmDggu58391f8WhtbzQFGC4tWUJRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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