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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d87d7d6664173e4ee05f1a8fba24eb44d102c8aeb52bde4df792880b230707' 
  AND token = '8I6fTYiMeRxnUEEdU4vhUlTknXDJjzEf7vMkFvU1X3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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