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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8007812ff500057a3e2d366f1a0ac6a547b025a8513bfeedac514e22503a15' 
  AND token = '7uvZHYu0f5t9FgP2DneHOrh+aWxp/3AMZv1mVS1OlxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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