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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff31e987e645e31740573387169f663816e3eb9d28728cecd5eebc78e956c84' 
  AND token = 'dvQ+2i6y5roDo4XZa42w2NiUto8fv4Tg2UF+hj6D5tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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