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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9762ac6d0d10e6119cb050131e27a38ce9e4ca03392c9f0a1f8c1041352a982' 
  AND token = 'SzJYHEDq+NdAiyTDnBnzlB21iDwrEh70N5am+YvSoj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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