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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371b97833a89e4d0dfcfd8fed5106f3b44849a87ef567b4aaf7ba3bd1ed76b4e' 
  AND token = 'dsVO+ajzDp/TbvY/3TShwctR2ihhWYAgD/HX/myvdak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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