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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81475d3b07e3232c4c2a66bc222d4bcf9dfa5a6699eeb5dae10c99c11e2b8e45' 
  AND token = 'cZmOaYJSyPj30/Dqb1KwTj7ABZ4RDTD/yBZnS5AYR88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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