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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdaf3b7b5a5c099e2913201f4f571cfdf32999b9357786a8893f19df01f6fdc' 
  AND token = 'kWl2EUaNkhzn//52gARw/MrAHxeGQ7oI54dN8l1WJ/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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