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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7508ff182add09952efaf3030468f7667b0acac47b254f6a6b44514472fd796' 
  AND token = 'UDYsbiJGbiXjeBpf6Bx0jUtZQiOYkCNViY2nQDCV20w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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