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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898d6cca648fc9d2f9a595e59eaafa2e8ed14e302c1ed193898c4a66d27e38b3' 
  AND token = 'Ckr88XfxRdGI7iNX8xZKb2Z3tdJYK9txKy6tv7vroKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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