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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2696fe1bcf4fd0c792f6ae4da0b4b8e008bce7b658f14566632d24d1594afec4' 
  AND token = 'icCvgjqm9R4yWXzHf23sb4iCceTWJqnipDrZ9Eno0QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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