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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e7216c7328fc96fd97ab4ecff571917f38f3d69c20e52be72d0f91688e30b2' 
  AND token = '90AVAE42dLoCqUBFpNGTlTTmWaDhAPqzAabwz4ICHvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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