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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '172b02ca424ab2f69bac63fc38b5c4db6f3383a72675ba9ba7dd42b7c903edb4' 
  AND token = '5VPC+PaDyCgLTKXUY4KSE5L4KYGUzCtRpydJCWHnzJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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