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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95f5344929726ba852717eaf16fcf3d4afe09abe29c656ceb86f7f1e46343e8' 
  AND token = 'IlFu5rPsfgqXmy0ekAFfISzTF2SkzEZ9CIFHTxmiWWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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