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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e5a664c3e07f7e6719ec07e907bf0e8af5f491e984e8deb3a222ef083bbb158' 
  AND token = 'jVmN/cbMfKvPws4tzEW8o6l9AZP3pW5bhmOo0NaooO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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