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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b477e4297be3a702d94f1262b3ccab6e80b696dfed41e4dd7b49260cd4749b' 
  AND token = 'TWJv3hfH918lq2Qn+EHZwcOT4U9IQo7alkedWf+POio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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