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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a633652c51808339a6162b8b46d8812872eee3763f2b388a9ae78596173261' 
  AND token = 'JsZk5LTVGyufizPLaFwN4+QUS6IN3KSoVr1i5Wk4Ak8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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