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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d440d93c8bf81a6cb17fd4d6683d6793d8e7aefd04b3d4a564cc0b918cceb9' 
  AND token = '5bAo9KtguFUQYyJiDWS4gJNfZu2mZJU0SCVtuNeF9JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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