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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68b9068670e53636b6d229cd9d5ac7a2cf8062ed55abcd0bfa39744b5779542' 
  AND token = 'iVNlpTglRiOEjsmnPXhkV17nld0y1//bh9f3Nlzzkjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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