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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de7c52a8c6543d59916ab46dd0ee07b7ac5903c6a8a4f600f8a8ed06a4b3d91' 
  AND token = 'W4hvV2An4y+ACEi2AdCnZpcTuFpx/T5RwFIXqyAJR1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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