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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906d18e029fd6993f3c199c305bb4840a6761d3ae0a8a5ae86811cd50fe9f377' 
  AND token = '5fvM+lmcgr/G8NAwcIg6ZlGUbniMmauCyBVMR8t6+GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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