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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e08347ac28a774ef89f1b152cf162de798d02e8e07cc4e6a24bcaf28f555e3' 
  AND token = 'yjGMe8I7iTyVKa2o+n/HuBfpuDZSwBkXovMrjZlSgSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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