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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '115eb0b4282d97bbf58ea67c155263c9415ec2b39dac8134a47e80dd2d03fac1' 
  AND token = 'ekuJ74Fy+HzVXniwb6ZuM4J3aBpya1CcnucVTmTzO1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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