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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70dd20eae74ed1a19918e275e8edd96117f17bd9548ec9e09c484ff4736f088f' 
  AND token = 'm68nT9pF02goIA18sBJRRTYB59MjISNkoHClBjBan78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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