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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b223da4118e52593434a09403cc4feff7822f47973f5b03643e62c2a07c5d28e' 
  AND token = 'pY9eiBWS2F/WipZAUVu6SWBSGp5ryJKAlzSMr2XPe6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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