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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91626c4fee226723678b13891388a0b9dbed6c2dfdbbf38d9f9652ab9dcd9cf' 
  AND token = 'LCNw08ArQhfYVGfAEVjvIEQM69kmFL+XaFDHjaZRznc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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